I did a bit of research on Kentucky fortifications several years ago, to include visiting the sites of identified forts, batteries, stockades, and blockhouses. Although there were several blockhouses at railroad bridges along the L&N and Ky. Cent. RRs, as far as I know, none of these exist today (or any trace).
If anyone knows any different, I'd like to hear of it as well.
Geoff Walden